/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.streamline.services;

import java.util.Random;

/**
 * Utility class providing mathematics-related services.
 */
public class MathServices {

    public static Random    random;

    public static int       DEFAULT_LENGTH = 16;

    static{
        random = new Random();
    }

    public static String newId() {
        return newId( DEFAULT_LENGTH );
    }

    public static String newAlnumId() {
        return newAlnumId( DEFAULT_LENGTH );
    }

    public static String newId(int length) {
        return randomId( length, StringServices.EMGLISH_ABC ) + "_" + System.currentTimeMillis();
    }

    public static String randomId(int length) {
        return  randomId( length, StringServices.EMGLISH_ABC );
    }

    public static String newAlnumId(int length) {
        return randomId( length, StringServices.EMGLISH_ALNUM_ABC ) + "_" + System.currentTimeMillis();
    }

    public static String randomAlnumId(int length) {
        return  randomId( length, StringServices.EMGLISH_ALNUM_ABC );
    }

    public static String newGraphId(int length) {
        return randomId( length, StringServices.EMGLISH_GRAPH_ABC ) + "_" + System.currentTimeMillis();
    }

    public static String randomGraphId(int length) {
        return  randomId( length, StringServices.EMGLISH_GRAPH_ABC );
    }

    public static String randomId(int length, char[] chars) {
        StringBuffer buffer = new StringBuffer();

        while (length-- != 0) {
            char ch = chars[random.nextInt( chars.length ) ];

            buffer.append(ch);
        }
        return buffer.toString();
    }

}
